A group of House Democrats on Wednesday urged Immigration and Customs Enforcement and the Department of Homeland Security to refrain from re-detaining previously released migrants due to coronavirus concerns.

ICE’s detention policies across several field offices have “been inconsistent” and caused “great uncertainty” for migrants, wrote the 40 Democrats, led by Washington Rep. Pramila Jayapal, in a letter to DHS Secretary Alejandro Mayorkas and acting ICE Director Tae Johnson.